Java run Windows cmd command simple code _java

I don't know what it's called, just like I'm going to open My computer's computer, and I can just type "calc" directly at the command line.
Now use your code to execute it.

Copy Code code as follows:

public static void Main (string[] args) throws IOException {
Runtime.getruntime (). EXEC ("calc");
}

The result is as shown in figure:

Because it is a campus network, usually sleep when the 360wifi plug in the computer to open WiFi, and then go to bed to play mobile phone, the end does not want to shut down the computer, so I wrote a phone off the computer applet. That's the principle.